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US8585330B2 - Cutting insert - Google Patents

Cutting insert Download PDF

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Publication number
US8585330B2
US8585330B2 US12/737,796 US73779609A US8585330B2 US 8585330 B2 US8585330 B2 US 8585330B2 US 73779609 A US73779609 A US 73779609A US 8585330 B2 US8585330 B2 US 8585330B2
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US
United States
Prior art keywords
corner edge
rake face
edge
cutting
wall surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US12/737,796
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English (en)
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US20110142555A1 (en
Inventor
Kazuya Yamazaki
Kenji Sugawara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Materials Corp
Original Assignee
Mitsubishi Materials Corp
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Filing date
Publication date
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Assigned to MITSUBISHI MATERIALS CORPORATION reassignment MITSUBISHI MATERIALS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAMAZAKI, KAZUYA, SUGAWARA, KENJI
Publication of US20110142555A1 publication Critical patent/US20110142555A1/en
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Publication of US8585330B2 publication Critical patent/US8585330B2/en
Expired - Fee Related legal-status Critical Current
Adjusted expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
    • B23B27/143—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness characterised by having chip-breakers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/04—Overall shape
    • B23B2200/049—Triangular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/20—Top or side views of the cutting edge
    • B23B2200/201—Details of the nose radius and immediately surrounding area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/32—Chip breaking or chip evacuation
    • B23B2200/321—Chip breaking or chip evacuation by chip breaking projections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/32—Chip breaking or chip evacuation
    • B23B2200/323—Chip breaking or chip evacuation by chip breaking depressions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/11—Cutters, for shaping including chip breaker, guide or deflector detachable from tool and tool holder
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges

Definitions

  • the present invention relates to a cutting insert which is attached to an insert-detachable turning tool and is capable of reliably controlling chips during light cutting from medium cutting with relatively large cutting amount to finish cutting with small cutting amount.
  • a cutting insert capable of performing chip control over a wide range from the above-described medium cutting to the finish cutting has been proposed, for example, in Patent Document 1.
  • a breaker groove along a cutting edge is formed on a rake face, and a protrusion on a boss surface extends at a corner edge of the cutting edge.
  • the leading end of the protrusion assumes a concave shape so as to enclose the corner edge, when viewed from above.
  • An erecting surface with an erecting angle of 10° to 30° which projects from two top portions of the thus concaved protrusion to the vicinity of the cutting edge so as to be the longest length is formed at the cutting insert.
  • the erecting surface is formed so as to be further away from the cutting edge, as the erecting surface extends away from the corner edge.
  • the cutting insert proposed in Patent Documents 2 and 3 is provided with an indentation near a corner edge on a rake face. At a region opposite to the corner edge of the indentation, an inclined surface which serves as a breaker and a rib are provided.
  • Patent Document 1 Japanese Published Unexamined Patent Application No. 2006-272548
  • Patent Document 2 Japanese Patent No. 2966007
  • Patent Document 3 Japanese Published Unexamined Patent Application No. 2004-216510
  • the present invention has been made in view of the above-described circumstances, an object of which is to provide a cutting insert which will harm smooth control of chips, when the cutting insert having a cutting edge including a corner edge with a small radius as described above is used to perform the extremely shallow cutting and finish cutting, and which can also be thereby used during the medium cutting process for a long time.
  • a cutting insert of the present invention is provided with an insert main body having a rake face, a cutting edge which is formed at a circumferential edge of the rake face of the insert main body to have a corner edge and two side edges arranged on both sides of the corner edge, a protrusion portion which is formed on the rake face inside the corner edge so as to protrude, with a space kept between the cutting edges, and a pair of convex portions formed from a wall surface of the protrusion portion to the rake face so as to extend out to the side edges on both sides divided by a bisector of the corner edge.
  • Each of the pair of convex portions is provided with a first wall surface and a second wall surface, the first wall surfaces extend so as to extend away gradually from each other toward the cutting edge from the wall surface of the protrusion portion, each facing the corner edge of the cutting edge, the second wall surface contacts the first wall surface, facing the side edge continuing to an end of the corner edge.
  • the first and the second wall surfaces are inclined surfaces inclining toward the rake face as they extend away from a ridge line between both wall surfaces, and the ridge line is in contact with the wall surface of the protrusion portion at a position lower than the top portion of the protrusion portion closer to the corner edge.
  • a recess which has a rear wall portion extending so as to cross the bisector in the middle between the corner edge and the convex portion and which is recessed with respect to the corner edge is formed.
  • one convex portion is provided with a first wall surface which faces the corner edge and extends from the wall surface to one of the side edges, and a second wall surface which faces the one of the side edges and is in contact with the first wall surface along a ridge line.
  • the other convex portion is provided with a first wall surface which faces the corner edge and extends from the wall surface to the other of the side edges, and a second wall surface which faces the other of the side edges and is in contact with the first wall surface along the ridge line.
  • the first and the second wall surfaces at the one convex portion incline toward the rake face as they extend away from the ridge line, whereas the first and the second wall surfaces at the other convex portion incline toward the rake face as they extend away from a ridge line.
  • the respective ridge lines of the one convex portion and the other convex portion are in contact with the wall surface at a position lower than the top portion of the protrusion portion closer to the corner edge.
  • a recess which is recessed with respect to the corner edge is formed.
  • a rear wall portion which spread so as to cross the bisector between the corner edge and these two convex portions is provided.
  • chips generated around the corner edge of the cutting edge during finish cutting in which the depth of the cut is larger than the depth of the cut in extremely shallow cutting process but which is smaller than the depth of the cut in medium cutting flow over the recess and flow out between the first wall surfaces of the pair of convex portions. Then, the chips are guided by these first wall surfaces to collide with the wall surface of the protrusion portion, and are thereby curled by resistance and controlled accordingly.
  • a ridge line between the first and the second wall surfaces is in contact with the wall surface of the protrusion portion at a position lower than the top portion of the protrusion portion closer to the corner edge. That is, a protrusion height of the top portion of the protrusion portion is made higher than a contact point of the wall surface of the protrusion portion with the ridge line. Therefore, it is possible to prevent chips generated during finish cutting from not being curled and going beyond the protrusion portion to flow out.
  • the convex portion is that which extends out from the wall surface of the protrusion portion. Therefore, a sufficient thickness of the convex portion is kept at the second wall surface closer to the protrusion portion. It is, thus, possible to suppress abrasion of the convex portion and control the chips stably over a long time. Further, since the wall surface of the protrusion portion is erected at the second wall surface closer to the protrusion portion, the chips in contact with the second wall surface are allowed to collide with the wall surface of the protrusion portion and be reliably controlled.
  • the above-described recess may have a pair of front wall portions extending along the side edge continuing the both ends of the corner edge.
  • the rear wall portion of the recess may extend toward the corner edge in a direction along the bisector, as approaching to both ends from the central part located on the bisector, and may be connected to the front wall portion.
  • the recess may be provided with one of the front wall portions extending along the one of the side edges continuing to the corner edge and the other of the front wall portions extending along the other of the side edges continuing to the corner edge. Then, the rear wall portion may gradually approach to the corner edge as it extends toward the one of the side edges from the bisector and be connected to the one of the front wall portions. Also, the rear wall portion comes closer to the corner edge toward the other of the side edges from the bisector and may be connected to the other of the front wall portions.
  • the rear wall portion can be disposed so as to oppose a direction of which chips generated by the corner edge flow out, thereby making it possible to control the chips more reliably.
  • the protrusion height of the rear wall portion of the recess may be lower than the height at a contact point where a ridge line between the first wall surface and the second wall surface of the convex portion is in contact with the wall surface of the protrusion portion. That is, the rear wall portion may be formed at a position which is lower than a contact point where the wall surface is in contact with the ridge line of the one convex portion and also lower than a contact point where the wall surface is in contact with the ridge line of the other convex portion.
  • the top portion of the protrusion portion may be formed in a multi-stage shape in which the opposite side of the corner edge protrude via a step portion with respect to the corner edge. That is, the step portion may be provided at the top portion of the protrusion portion which faces the corner edge.
  • the protrusion height of the top portion of the protrusion portion close to the corner edge is excessively high and also prevent a tendency of clogging of chips during finish cutting, by which resistance caused by chips can be reduced.
  • the step portion opposite to the corner edge can be used to reliably control chips during medium cutting.
  • a part between the first wall surfaces of the pair of convex portions may be formed in such a manner that the rake face extends directly from the corner edge of the cutting edge.
  • a rib portion which is narrower in width than the space between these first wall surfaces and lower in protrusion height than the convex portion is formed along the bisector between the first wall surfaces of the pair of convex portions, and the rib portion close to the corner edge may be connected to the rear wall portion of the recess.
  • the cutting insert of the present invention may be provided with a rib portion formed on the rake face between the two first wall surfaces. Then, the rib portion may extend along the bisector, the end close to the corner edge being in contact with the rear wall portion, the rib portion may be lower than either of the two convex portions, and the width of the rib portion may be narrower than a space between the first wall surface of the one convex portion and the first wall surface of the other convex portion.
  • the rib portion can be used for controlling chips not only generated during simple turning, but also particularly generated during finish cutting of copy turning.
  • the chips are curled by receiving resistance and colliding with one or the other of the first wall surfaces of the pair of convex portions located on the both sides of the rib portion.
  • the chips are fragmented and controlled while the flow out direction of the chips is controlled.
  • chips which are generated by the cutting edge during finish cutting of copy turning from the corner edge in a certain range on one or the other side of the bisector flow out inside the rake face while scraping and passing over the rake face from the one side, colliding with a side face of the rib portion.
  • the chips are curled by resistance during scraping and passing over the rake face, and the flow out direction of the chips is controlled by the side surface of the rib portion.
  • the chips from the rib portion collide with the wall surface of the protrusion portion inside of the rib portion, or one or the other of the first wall surfaces of the pair of convex portions, so the chips can be reliably controlled.
  • the controllability of the chips during finish cutting in which depth of the cut is relatively small can be secured by the pair of convex portions and the protrusion portion. Further, chips generated during extremely shallow cutting process can be satisfactorily controlled by the recess which is closer to the corner edge than the pair of convex portions. Still further, chips generated during medium cutting in which depth of the cut is relatively large are controlled stably by the pair of convex portions, thus making it possible to suppress abrasion of the convex portions. It is, thereby, possible to provide the cutting insert with a longer service life and which is capable of being used to control chips stably over a long period of time.
  • FIG. 1 is a perspective view which shows a first embodiment of the present invention.
  • FIG. 2 is a plan view which shows the first embodiment in FIG. 1 viewed from the thickness direction of an insert main body 1 .
  • FIG. 3 is an enlarged perspective view showing a periphery of a corner edge 4 A of a cutting edge 4 in the first embodiment shown in FIG. 1 .
  • FIG. 4 is an enlarged plan view which shows a periphery of the corner edge 4 A of the cutting edge 4 in the first embodiment shown in FIG. 1 .
  • FIG. 5 is a cross sectional view taken along line A to A in FIG. 4 .
  • FIG. 6 is a cross sectional view taken along line B to B in FIG. 4 .
  • FIG. 7 is a cross sectional view taken along line C to C in FIG. 4 (a cross section orthogonal to a ridge line M).
  • FIG. 8 is a cross sectional view taken along line D to D in FIG. 4 (a cross section orthogonal to an inclined portion 4 C of the cutting edge 4 when viewed from above in the thickness direction).
  • FIG. 9 is an enlarged perspective view showing a periphery of a corner edge 4 A of a cutting edge 4 in a second embodiment of the present invention.
  • FIG. 10 is an enlarged plan view which shows a periphery of the corner edge 4 A of the cutting edge 4 of the second embodiment in FIG. 9 .
  • FIG. 11 is a cross sectional view taken along line A to A in FIG. 10 .
  • FIG. 12 is a cross sectional view taken along line B to B in FIG. 10 .
  • FIG. 13 is a cross sectional view taken along line F to F in FIG. 10 .
  • FIG. 14 is a cross sectional view taken along line C to C in FIG. 10 (a cross section orthogonal to the ridge line M).
  • FIG. 15 is a cross sectional view taken along line D to D in FIG. 10 (a cross section orthogonal to the inclined portion 4 C of the cutting edge 4 , when viewed from above in the thickness direction).
  • FIG. 1 to FIG. 8 show the first embodiment of the present invention.
  • An insert main body 1 is formed in a polygonal flat plate-like shape (in particular, in the present embodiment, in an equilateral triangle flat plate-like shape) by a hard material such as cemented carbide.
  • Two equilateral triangle-like rake faces 2 are formed on the both sides of the insert main body 1 .
  • Three flank faces 3 arranged around these two rake faces 2 are parallel to the thickness direction of the insert main body 1 (the up-down direction in FIG. 5 to FIG. 8 ) and perpendicular to the rake faces 2 .
  • the cutting insert of the present embodiment is a so-called negative type cutting insert.
  • the insert main body 1 is formed in such a manner that the pair of equilateral triangle surfaces are an inversion symmetry in obverse and reverse and formed in a 120° rotational symmetry shape with respect to the center line of the equilateral triangle surface. Further, the insert main body 1 is formed in a symmetrical shape with respect to a flat surface parallel with the thickness direction including a bisector (bisector L to be described later) of each corner of the equilateral triangle.
  • a cutting edge 4 is formed at a circumferential edge of the rake face 2 in contact with the flank 3 .
  • the cutting edge 4 which is positioned at each corner of the equilateral triangle-like rake face 2 is provided with a corner edge 4 A which is positioned at the apex of the corner and two side edges 4 X which are arranged on both sides of the corner edge 4 A.
  • the corner edge 4 A is formed in a convex circular arc shape when the insert main body 1 is viewed from above in the thickness direction and also extends perpendicularly with respect to the thickness direction of the insert main body 1 .
  • each of the two side edges 4 X is provided with a pair of tangent portions 4 B extending as tangent lines of the corner edges 4 A from each end of the corner edges 4 A when viewed from above and also extending so as to be flush with the corner edge 4 A in the thickness direction, a pair of inclined portions 4 C continuing from the tangent portions 4 B and inclining so as to gradually sink down in the thickness direction in a linear fashion as they extend away from the corner edge 4 A, and a straight line portion 4 D continuing from the tangent portions 4 B and the inclined portions 4 C on a straight line and also extending perpendicularly in the thickness direction, when viewed from above, on the opposite side to the corner edge 4 A over the inclined portions 4 C.
  • a protrusion portion 5 is formed so as to be separated from the cutting edge 4 and protrude from the rake face 2 in the thickness direction.
  • the protrusion portion 5 is provided with a first top portion 5 A, a second top portion 5 C and a wall surface 5 D.
  • the first top portion 5 A is a flat surface perpendicular to the thickness direction.
  • the first top portion 5 A protrudes in the thickness direction so as to be higher than the cutting edge 4 .
  • the protrusion height of the first top portion 5 A is the highest in the protrusion portion 5 .
  • the second top portion 5 C sinks in one step via the step portion 5 B from the first top portion 5 A in the thickness direction.
  • the height of the second top portion 5 C is made slightly lower than the height of cutting edge 4 at the corner edge 4 A.
  • the second top portion 5 C is also a flat surface perpendicular to the thickness direction.
  • the wall surface 5 D inclines so as to be gradually higher in the thickness direction as the wall surface 5 D extend away from the corner edge 4 A and approaches the second top portion 5 C.
  • a mounting hole 6 is opened into the first top portion 5 A.
  • the mounting hole 6 is formed so as to penetrate through the insert main body 1 in the thickness direction at the center of the rake face 2 .
  • the protrusion portion 5 is formed so as to taper toward the corner edge 4 A as shown in FIG. 4 , when the insert main body 1 is viewed from above in the thickness direction.
  • a part facing the corner edge 4 A on the wall surface 5 D along a bisector L of the corner edge 4 A (a bisector of each corner of an equilateral triangle formed by the rake faces 2 ) and the above-described step portion 5 B are formed as a convex-curved surface which is formed in an inclined cylindrical surface shape or in a circular truncated cone surface shape, the diameter of which is gradually reduced toward the first top portion 5 A and the second top portion 5 C and is curved along the corner edge 4 A.
  • this part and the step portion 5 B are being gradually higher as they extend away from the corner edge 4 A, as described above.
  • the wall surface 5 B part inside the inclined portion 4 C and the straight line portion 4 D of the cutting edge 4 is formed as an inclined surface.
  • the inclined surface of the wall surface 5 B part is formed gradually higher toward the first top potion 5 A as it extend away from the corner edge 4 A, and has alternately disposed convexly vault convex-curved surfaces and concavely vault concave-curved surfaces.
  • a part of the rake face 2 close to the cutting edge 4 is formed as a positive rake face 2 A via a flat land between the cutting edges 4 .
  • the positive rake face 2 A sinks in gradually toward the inside thereof in a cross section orthogonal to the cutting edge 4 .
  • the positive rake face 2 A also inclines according to an inclination of the cutting edge 4 .
  • a flat rake face 2 B is formed as a flat surface perpendicular to the thickness direction further inside than the positive rake face 2 A. The flat rake face 2 B is in contact with an external edge of the wall surface 5 D of the protrusion portion 5 .
  • a pair of convex portions 7 are formed from the wall surface 5 D of the protrusion portion 5 to the rake face 2 in a periphery of the corner edge 4 A so as to extend out to the cutting edge 4 on the both sides divided by the bisector L of the corner edge 4 A.
  • Each of these convex portions 7 is constituted with a first wall surface 7 A and a second wall surface 7 B.
  • the first wall surface 7 A faces the corner edge 4 A.
  • the first wall surfaces 7 A facing each other and gradually extend away from each other as approaching to the cutting edge 4 from the wall surface 5 D of the protrusion portion 5 .
  • the first wall surface 7 A extends to an end of the tangent portion 4 B of the cutting edge 4 opposite to the corner edge 4 A.
  • the second wall surface 7 B in contact with the first wall surface 7 A via a ridge line M.
  • Each of the second wall surfaces 7 B extending to the respective inclined portion 4 C of cutting edge 4 mutually opposite for the pair of convex portions 7 .
  • the ridge line M part is chamfered and the corners are rounded off.
  • a contact point P at which the ridge line M is in contact with the wall surface 5 D of the protrusion portion 5 is arranged at a position slightly lower in the thickness direction than the second top portion 5 C closer to the corner edge 4 A of the protrusion portion 5 . That is, the convex portion 7 is, as a whole, made lower in protrusion height than the second top portion 5 C of the protrusion portion 5 particularly closer to the corner edge 4 A in the thickness direction.
  • the respective contact points P of the pair of convex portions 7 are positioned on the side of the convex-curved surface near a part where the convex-curved surface part facing the corner edge 4 A is consecutively connected with a part extending inside the inclined portion 4 B.
  • the convex-curved surface part formed in a cylindrical surface shape in which the wall surface 5 D at the leading end of the protrusion portion 5 inclines or a circular truncated cone surface shape is remained so as to extend along the bisector L between the both first wall surfaces 7 A of these convex portions 7 .
  • the first wall surface 7 A extends out to a positive rake face 2 A inside the inclined portion 4 C from parts on the sides of both ends of the convex-curved surface part in a curved direction on the wall surface 5 D of the protrusion portion 5 .
  • the first wall surface 7 A is separated from the tangent portion 4 B of the cutting edge 4 .
  • a ridge line M contact the positive rake face 2 A at a contact point Q.
  • the first wall surface 7 A is formed as an inclined flat surface which inclines at a constant inclination angle ⁇ to a direction perpendicular to the thickness direction toward the ridge line M from the rake face 2 in a cross section orthogonal to the ridge line M, as shown in FIG. 7 .
  • the rake face 2 between these first wall surfaces 7 A of the pair of convex portions 7 is formed as the flat rake face 2 B perpendicular to the thickness direction.
  • the second wall surface 7 B extends out to the positive rake face 2 A inside the inclined portion 4 C from the wall surface 5 D continuing to the second top portion 5 C of the protrusion portion 5 inside the inclined portion 4 C of the cutting edge 4 .
  • the second wall surface 7 B is formed as an inclined flat surface which inclines at a constant inclination angle ⁇ to a direction perpendicular to the thickness direction, as the second wall surface 7 B is spaced away from the ridge line M. Further, the inclination angle ⁇ is made smaller than the inclination angle ⁇ of the first wall surface 7 A. As shown in FIG.
  • the second wall surface 7 B is gradually increased in width in a direction orthogonal to the ridge line M toward a direction spaced away along the inclined portion 4 C from the both ends of the corner edge 4 A, and a space between the cutting edge 4 (the inclined portion 4 C) and a ridge line formed with the positive rake face 2 A is also gradually increased.
  • the ridge line M is formed in a straight line in which a part on the side of the contact point Q is convexly curved forming a circular arc shape from the rake face 2 and a part on the side of the contact point P extends perpendicularly to the thickness direction smoothly in contact with a circular arc on the side of the contact point Q.
  • the second wall surface 7 B is also formed in a convex-curved surface such as a cylindrical surface which is curved so as to be convexly curved along the ridge line M, while inclining at the inclination angle on the side of the contact point Q or a circular conical surface.
  • the second wall surface 7 B is formed in an inclined flat surface which is smoothly in contact with the convex-curved surface, extending in a direction perpendicular to the thickness direction in the direction of the ridge line M, while inclining at the inclination angle ⁇ .
  • the protrusion height of the contact point P in the thickness direction is made approximately equal to a height of the cutting edge 4 at the corner edge 4 A. Therefore, the ridge line M forms approximately a half ellipse shape dividing an ellipse along a long axis direction, when viewed from a direction opposing to the first wall surface 7 A.
  • the protrusion height of the contact point P is higher than the protrusion height of the contact point Q.
  • the second wall surface 7 B inclines so as to sink in gradually also in a cross section orthogonal to the inclined portion 4 C of the cutting edge 4 , as the second wall surface 7 B extend away from the ridge line M.
  • an inclination angle of this cross section is gradually increased toward the rake face 2 .
  • an inclination angle ⁇ of the second wall surface 7 B in the cross section is made smaller than an inclination angle ⁇ of the first wall surface 7 A in a cross section orthogonal to the ridge line M, as shown in FIG. 7 . Therefore, the inclination of the second wall surface 7 B at any portion in a cross section orthogonal to the cutting edge 4 become more gentle than the inclination of the first wall surface 7 A in the cross section orthogonal to the ridge line M.
  • a recess 8 which sink in more than a protrusion height of the cutting edge 4 at the corner edge 4 A in the thickness direction, and recessed with respect to the cutting edge 4 is formed. As shown in FIG.
  • the recess 8 is constituted with a pair of front wall portions 8 A extending parallel to the tangent portion 4 A of the side edge 4 X continuing to the corner edge 4 A approximately from the center of an arc formed by the corner edge 4 A, a bottom surface 8 B positioned between these front wall portions 8 A, and a rear wall portion 8 C on the opposite side of the corner edge 4 A of the bottom surface 8 B, standing from the bottom surface 8 B, positioned in the middle portion which is approximately at the center between the corner edge 4 A of the cutting edge 4 and the contact point Q of the pair of convex portions in the direction of the bisector L, and extending so as to pass across the bisector L.
  • the bottom surface 8 B is a flat surface perpendicular to the thickness direction and approximately be the same height with the flat rake face 2 B formed between the first wall surfaces 7 A of the pair of convex portions 7 .
  • the front wall portion 8 A is an inclined flat surface which sink in to the thickness direction as the front wall portion 8 A extend away from the cutting edge 4 at a inclination steeper than the positive rake face 2 A continuing to the corner edge 4 A and the tangent portion 4 B of the cutting edge 4 .
  • the rear wall portion 8 C extends in a V-shape, when viewed from above, while being slightly recessed, and curved to the side edge 4 X from its central portion positioned on the bisector L toward both ends of itself.
  • the rear end portion 8 C is connected to each of the front wall portions 8 A.
  • a pinched angle of V-shape formed by the rear wall portion 8 C is larger than a pinched angle formed by the pair of tangent portions 4 B continuing to the corner edge 4 A of the cutting edge 4 or a pinched angle formed by the facing first wall surfaces 7 A of the pair of convex portions 7 .
  • the protrusion height of the rear wall portion 8 C in the thickness direction from the bottom surface 8 B is the highest at the central part of the bisector L and gradually lowered toward a part connect to the front wall portion 8 A.
  • the protrusion height of the rear wall portion 8 C at the central part thereof is made sufficiently lower than the height of the contact point P where the ridge line M of the convex portion 7 contacts the protrusion portion 5 .
  • the rear wall portion 8 C is an inclined surface which rises gradually toward the opposite side of the corner edge 4 A, and the inclination angle thereof with respect to the bottom surface 8 B is made steeper than the inclination angle of the front wall portion 8 A with respect to the bottom surface 8 B.
  • the back surface facing the opposite side of the corner edge 4 C of the rear wall portion 8 C is an inclined surface formed by extended positive rake face 2 A continuing from the tangent portion 4 B of the cutting edge 4 .
  • the inclination angle thereof with respect to the flat rake face 2 B is made more gentle than the inclination angle of the rear wall portion 8 C with respect to the bottom surface 8 B of the recess 8 .
  • the second wall surface 7 B of the convex portion 7 is formed in such a manner that the ridge line M with the first wall surface 7 A is in contact with the wall surface 5 D of the protrusion portion 5 at a contact point P lower than the second top portion 5 C of the protrusion portion 5 .
  • an angle of the second wall surface 7 B in a direction toward the rake face 2 for example, an inclination angle ⁇ in a cross section orthogonal to the cutting edge 4 can be decreased, if a height of the second top portion 5 C on the side of the corner edge 4 and a space between the cutting edge 4 and the second wall surface 7 B are equal.
  • the convex portion 7 can keep a sufficient thickness between the second wall surface 7 B and the wall surface 5 D of the protrusion portion 5 . Therefore, it is possible to more reliably prevent the convex portion 5 from being abraded.
  • the contact point P is disposed at a position lower than the second top portion 5 C, by which the wall surface 5 D of the protrusion portion 5 is erected at an angle steeper than the above-described angle inside the second wall surface 7 B.
  • the second top portion 5 C of the protrusion portion 5 is made slightly higher in protrusion height than the corner edge 4 A and the convex portion 7 . Even thin and extendish chips generated during finish cutting do not flow over the protrusion portion 5 to flow out, thus making it possible to control the chips reliably.
  • the first and the second top portions 5 A, 5 C of the protrusion portion 5 are formed in a multi-stage shape in which the corner edge 4 A and the first top portion 5 A on the opposite side of the corner edge 4 A are protruded one step via the step portion 5 B with respect to the second top portion 5 C on the side of the corner edge 4 A. Therefore, it is possible to prevent the height of the second top portion 5 C from being higher than necessary and to avoid the tendency of chips from clogging result in an increased resistance. On the other hand, even if the slightly extended chips flow over the second top portion 5 C, they will collide with the step portion 5 B continuing the first top portion 5 A. Thus, controllability of the chips is not lowered.
  • the chips are guided inside the recess 8 closer to the corner edge 4 A than the convex portion 7 .
  • the chips guided into the recess 8 are positioned in the intermediate portion between the corner edge 4 A and the pair of convex portions 7 , colliding with the rear wall portion 8 C of the recess 8 extending so as to pass across the bisector L. Therefore, the chips generated during a finish cutting in which extremely shallow depth of the cut can also be curled by allowing them to collide with the rear wall portion 8 C to give resistance.
  • reliable chip controlment can be realized in a huge variety of cutting conditions.
  • the recess 8 is provided with a front wall portion 8 A extending along the tangent portion 4 B of the side edge 4 X continuing to the both ends of the corner edge 4 A.
  • the front wall portion 8 A is formed so as to spread and extend from the corner edge 4 A to the opposite side of the corner edge 4 A in the direction of the bisector L. So, even the radius of a circular arc formed by the corner edge 4 A viewed from above is small, the size of the recess 8 in a flow out direction of chips can be ensured.
  • the rear wall portion 8 C extends in a inverted V-shape from its central portion toward the corner edge 4 A in the direction of the bisector L, when viewed from above.
  • the rear wall portion 8 C is arranged so as to face a flow out direction of the chips, allowing the chips to collide with the rear wall portion 8 C. Therefore, it is possible to control the chips more reliably during cutting in which such shallow depth of the cut.
  • the protrusion height of the rear wall portion 8 C is made lower than the contact point P where the ridge line M of the convex portion 7 contacts the protrusion portion 5 . Therefore, chips generated during finish cutting from the corner edge 4 A to the tangent portion 4 B of the cutting edge 4 as described above are not caught at the rear wall portion 8 C and do not block controlment of the chips. So, the chip control is never interfered with. That is, if the protrusion height of the rear wall portion 8 C is higher than the height of the contact point P in the thickness direction, the chips generated during finish cutting which should flow over the recess 8 as described above may not be reliably guided between the first wall surfaces 7 A of the pair of convex portions 7 .
  • an inclination angle ⁇ of the second wall surface 7 B in the cross section orthogonal to the ridge line M is smaller than an inclination angle ⁇ of the first wall surface 7 A in the same cross section.
  • an inclination angle ⁇ of the second wall surface 7 B in a cross section orthogonal to the inclined portion 4 C of the side edge 4 X continuing to the both ends of the corner edge 4 A is also made smaller than the inclination angle ⁇ , when viewed from above. Therefore, in particular during medium cutting, it is possible to more efficiently prevent wear of the convex portion 4 caused by chips generated by the side edge 4 X continuing from both ends of the corner edge 4 A.
  • the inclination angle ⁇ shown in FIG. 7 is 45°
  • the inclination angle ⁇ shown in FIG. 8 is 29.883°.
  • the part on the side of the contact point Q at which the ridge line M with the first wall surface 7 A is in contact with the rake face 2 is given as a convex-curved surface, as described above. It is, therefore, possible to decrease an area in contact with chips which scraping and passing over the rake face 2 (the positive rake face 2 A) generated by the inclined portion 4 C of the cutting edge 4 during medium cutting. Also, it is possible to reduce the resistance from the chips and the wear of the rake face 2 .
  • the first wall surface 7 A rarely wears even with the large inclination angle ⁇ . Rather, by setting the inclination angle ⁇ lager than the inclination angles ⁇ and ⁇ , it is possible to control the chips generated during the finish cutting so as to guide and collide the chips to the wall surface 5 B facing the corner edge 4 A of the protrusion portion 5 . Further, in the present embodiment, the wall surface 5 D facing the corner edge 4 A of the protrusion portion 5 is formed as the convex-curved surface part which is curved along a curvature of the cutting edge 4 at the corner edge 4 A. Therefore, even during finish cutting, it possible to reduce resistance from chips which were guided and collided.
  • the rake face 2 inside the corner edge 4 A and the tangent portion 4 B of the cutting edge 4 are formed as the positive rake face 2 A.
  • the rake face 2 between the first wall surfaces 7 A of the pair of convex portions 7 is formed as the flat rake face 2 B perpendicular to the thickness direction. Therefore, chips during finish cutting generated at the corner edge 4 A and the tangent portion 4 B to flow out along the positive rake face 2 A are allowed to collide temporarily with the flat cutting surface 2 B and are given a certain resistance, before collide to the first wall surface 7 A and the wall surface 5 D of the protrusion portion 5 therebetween. Thereafter, the chips collided with the wall surfaces 7 A and 5 D and curled. Therefore, it is possible to prevent such a situation that these chips get stuck since the chips from the positive rake face 2 collide directly with the wall surfaces 7 A and 5 D to receive large resistance.
  • FIG. 9 to FIG. 15 show a second embodiment of the present invention. Constituents common to the first embodiment will be denoted with the same reference numerals and an explanation thereof is omitted.
  • a rib portion 10 narrower than a space between the first wall surfaces 7 A and lower in protrusion height in the thickness direction than the contact point P of the convex portion 7 is formed along the bisector L at a part formed as the flat rake face 2 B between the first wall surfaces 7 A of the pair of convex portions 7 .
  • the rib portion 10 is connected to the rear wall portion 8 C of the recess 8 at an end closer to the corner edge 4 A.
  • the rib portion 10 extends from a position closer to the corner edge 4 A than the contact point P of the convex portion 7 in the direction of the bisector L on the wall surface 5 D of the protrusion portion 5 which is formed in a convex-curved surface shape and remained between the pair of convex portions 7 .
  • a width of the rib portion 10 is made slightly narrower than a space between these two first wall surfaces 7 A, thus keeping a space between the rib portion 10 and both convex portions 7 .
  • the protrusion height of the rib portion 10 in the thickness direction is lower than the contact point P of the convex portion 7 and, in the present embodiment, equal to the protrusion height of the rear wall portion 8 C of the recess 8 and is formed in a constant height, as shown in FIG. 11 .
  • the rib portion 10 of the present embodiment is formed in an isosceles trapezoid shape which tapers toward the tip in the thickness direction of a protruded ridge portion 10 A which protrudes from the rake face 2 .
  • the protruded ridge portion 10 A is a flat surface perpendicular to the thickness direction.
  • a ridge line between the protruded ridge portion 10 A and a side surface 10 B of the tapered rib portion 10 is a protruded ridge line portion 10 C having a circular-arc cross section which is smoothly in contact with the protruded ridge portion 10 A and the side surface 10 B.
  • the cutting insert of the second embodiment where the above-described rib portion 10 is formed is, as with the first embodiment, able to reliably control chips during from extremely low amount cutting as described above to finish cutting and medium cutting. Further, in particular, during finish cutting in which the corner edge 4 A and the tangent portion 4 B at the cutting edge 4 are mainly used and the cutting amount of which is smaller than medium cutting but not smaller than extremely low cutting, chips generated by the cutting edge 4 can be controlled by the rib portion 10 during not only simple turning where the insert main body 1 is fed parallel to the rotational axis line of a work piece but also copy turning where the insert main body 1 is fed in a direction other than a direction parallel to the rotational axis line copying the profile shape of the work piece.
  • chips generated during such a cutting amount in finish cutting of simple turning flow over the recess 8 along the bisector L as described above thus climb on the protruded ridge portion 10 A of the rib portion 10 connected to the rear wall portion 8 C of the recess 8 .
  • these chips which have flowed onto the rib portion 10 are curled by frictional resistance when scraping and passing over the protruded ridge portion 10 A, and colliding with one or the other of the pair of convex portions 7 higher in protrusion height than the rib portion 10 positioned on the both sides of the rake face 2 and positioned further inside the rake face 2 than the rib portion 8 .
  • the chips can be controlled by colliding the chips from the rib portion 10 with the convex-curved surface part of the wall surface 5 B along the bisector L of the protrusion portion 5 .
  • chips are generated at the cutting edge 4 from the corner edge 4 A to the tangent portion 4 B in a feeding direction and flow out on the rake face 2 inside the cutting edge 4 while changing the flow direction to the direction of bisector L by the movement of the insert main body 1 to the direction of bisector L. Meanwhile, the chips are given resistance and curled. Then, these chips which scraped and passed over the rake face 2 collide with the side surface 10 B of the rib portion 10 lower than the convex portion 7 which is convexly formed on the bisector L. Therefore, the flow out direction of the chips is controlled without clogging and the chips are controlled.
  • the rib portion 10 is made lower in protrusion height than the convex portion 7 . Therefore, during medium cutting where the depth of the cut is larger than the depth of the cut in finish cutting of the above-described simple turning and the copy turning, the rib portion 10 is hardly involved in control of chips and the chips are exclusively controlled by the second wall surface 7 B of the convex portion 7 . However, since the rib portion 10 is formed in the second embodiment, even if the convex portion 7 might be abraded to disappear, it is possible to control the chips by allowing the chips generated during medium cutting to collide with the rib portion 10 .
  • the cutting insert of the second embodiment it is possible to control the chips more reliably not only relatively large chips generated during medium cutting and chips generated during extremely shallow cutting process but also chips generated during finish cutting of simple turning and particularly copy turning. Thereby, it is possible to prevent a situation where chips are not sufficiently controlled and flow out direction of the chips becomes unstable and, for example, the chips are entangled on a tool body such as a cutting tool for retaining the insert main body 1 to unavoidably interrupt cutting work or the chips contact a finish-cut surface of a work piece and spoil the quality thereof.
  • a tool body such as a cutting tool for retaining the insert main body 1 to unavoidably interrupt cutting work or the chips contact a finish-cut surface of a work piece and spoil the quality thereof.
  • the protruded ridge portion 10 A of the rib portion 10 is a flat surface perpendicular to the thickness direction. Therefore, in particular where chips which have flown out along the bisector L during a cutting such as a finish cutting of simple turning flow over, scraping and passing over the protruded ridge portion 10 A, it is possible to increase the resistance given to the chips by enlarging the area at which the chips are in contact with the protruded ridge portion 10 A. Thus, it is possible to curl and control the chips more reliably.
  • a ridge line between the protruded ridge portion 10 A and the side surface 10 B of the rib portion 10 is formed as a protruded ridge line portion 10 C, a cross section of which is formed in a circular arc shape.
  • the rib portion 10 is formed approximately in a top down V-shape which tapers toward the protruded ridge portion 10 A or in an isosceles trapezoid shape in a cross section orthogonal to the bisector L along the thickness direction.
  • a certain inclination can be given to the side surface 10 B, and can form an obtuse angle with the rake face 2 which is formed as the flat rake face 2 B between the pair of convex portions 7 , for example, as shown in FIG. 13 .
  • the protruded ridge portion 10 A of the rib portion 10 may be, as a whole, formed as a protruded ridge line portion 10 C having a convex-curve line shape such as a half circular arc in the cross section.
  • the flat surface-like protruded ridge portion 10 A may be in contact with the side surface 10 B of the rib portion 10 so as to form a certain angle in the cross section, to secure flat surface area formed by the protruded ridge portion 10 A.
  • the rib portion 10 is formed in a peninsular shape which continues to the wall surface 5 B of the protrusion portion 5 between the pair of convex portions 7 and extends from the protrusion portion 5 to the direction of the bisector L.
  • the rib portion 10 may be formed in an isolated island shape so as to be spaced away from the protrusion portion 5 , while extending in the direction of the bisector L. If the rib portion 10 is formed in an isolated island shape having a space between the protrusion portions 5 as described above, a length of the rib portion 10 in the direction of the bisector L can be shortened. Therefore, for example, where chips which are easily fragmented are generated depending on the quality of material of a work piece, it is possible to prevent providing undue resistance to the chips and suppress an increase in cutting resistance.
  • a part between the pair of convex portions 7 is formed as the flat rake face 2 B perpendicular to the thickness direction in the rake face 2 .
  • the part may be formed in such a manner that directly extending the positive rake face 2 A extending from the cutting edge 4 .
  • the protrusion height of the protrusion portion 5 , the convex portions 7 , and the rib portion 10 from the positive rake face 2 A can be further increased. It is, therefore, possible to further intensify resistance act to the chips and control the chips more reliably.
  • the present invention relates to a cutting insert which is provided with an insert main body having a rake face, a cutting edge formed at a circumferential edge of the rake face of the insert main body to have a corner edge and two side edges arranged on the both sides of the corner edge, a protrusion portion formed on the rake face inside the corner edge to protrude, with a space kept between the cutting edges, and a pair of convex portions which are formed on both sides divided by a bisector of the corner edge from a wall surface of the protrusion portion to the rake face so as to extend out to the side edges.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
US12/737,796 2008-08-22 2009-08-21 Cutting insert Expired - Fee Related US8585330B2 (en)

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JP2008214320 2008-08-22
JP2008-214320 2008-08-22
JP2009-186448 2009-08-11
JP2009186448A JP5515504B2 (ja) 2008-08-22 2009-08-11 切削インサート
PCT/JP2009/004038 WO2010021155A1 (ja) 2008-08-22 2009-08-21 切削インサート

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US (1) US8585330B2 (de)
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JP (1) JP5515504B2 (de)
KR (1) KR101585283B1 (de)
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EP2322301B1 (de) 2017-03-01
KR20110055558A (ko) 2011-05-25
US20110142555A1 (en) 2011-06-16
KR101585283B1 (ko) 2016-01-13
JP2010069614A (ja) 2010-04-02
CN102123807A (zh) 2011-07-13
JP5515504B2 (ja) 2014-06-11
EP2322301A4 (de) 2012-02-29
EP2322301A1 (de) 2011-05-18
WO2010021155A1 (ja) 2010-02-25

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